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Details, datasheet, quote on part number:74FST163861
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Datasheet text preview:
IDT74FST163861 20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
20-BIT, TWO PORT BUS SWITCH
IDT74FST163861
FEATURES:
· · · ·
DESCRIPTION:
Bus switches provide zero delay paths Low switch on-resistance TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) · Hot insertion capability · Very low power dissipation · Available in SSOP and TSSOP packages
The FST163861 belongs to IDT's family of Bus switches. Bus switch devices perform the function of connecting or isolating two ports without providing any inherent current sink or source capability. They generate little or no noise of their own while providing a low resistance path for an external driver. These devices connect input and output ports through an n-channel FET. When the gate-to-source junction of this FET is adequately forward-biased, the device conducts and the resistance between input and output ports is small. With-out adequate bias on the gate-to-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot insertion capability. The low on-resistance and simplicity of the connection between input and output ports reduces the delay in this path to close to zero.
FUNCTIONAL BLOCK DIAGRAM
1O E
2OE
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9
A10 A11 A12 A13 A14 A15 A16 A17 A18 A19
B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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© 2002 Integrated Device Technology, Inc.
MAY 2002
DSC-5478/1
IDT74FST163861 20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND NC A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SSOP/ TSSOP TOP VIEW
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Terminal Voltage with Respect to GND Storage Temperature Maximum Continuous Channel Current Max 0.5 to +7 65 to +150 128 Unit V °C mA
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
VCC
1OE
VTERM(2) TSTG IOUT
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 Vcc
2OE
NOTES: 1 . Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2 . Vcc, Control, and Switch terminals.
CAPACITANCE(1)
Symbol CI N CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. 6 12 Unit pF pF
NOTES: 1 . Capacitance is characterized but not tested. 2 . TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V.
B1 0 B1 1 B1 2 B1 3 B1 4 B1 5 B1 6 B1 7 B1 8 B1 9
PIN DESCRIPTION
Pin Names Ax Bx xOE Description A Port Bits B Port Bits Output Enable Inputs (Active LOW)
FUNCTION TABLE(1)
Inputs xOE L H
NOTE: 1 . H = HIGH Voltage Level L = LOW Voltage Level
Outputs Connect A to B Disconnect A from B
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IDT74FST163861 20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = 40°C to +85°C, VCC = 5.0V ± 10%
Symbol VIH VIL IIH IIL IOZH IOZL VIK IOFF ICC Parameter Control Input HIGH Voltage Control Input LOW Voltage Control Input HIGH Current Control Input LOW Current Current During Bus Switch Disconnect Clamp Diode Voltage Switch Power Off Leakage Quiescent Power Supply Current VCC = Min., IIN = 18mA VCC = 0V, VIN or VO 5.5V VCC = Max., VIN = GND or VCC VCC = Max., VO = 0 to 5V Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND Min. 2 -- -- -- -- -- -- -- -- T y p . (2) -- -- -- -- -- -- 0.7 -- 0.1 Max. -- 0.8 ±1 ±1 ±1 ±1 1.2 ±1 3 V µA µA µA Unit V V µA
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40°C to +85°C, VCC = 5.0V ±10%
Symbol RON IOS Parameter Switch On Resistance, A to Short Circuit Current, A to B B (2)
(3)
Test Conditions VIN = 0V, ION = 12mA VIN = 2.4V, ION = 8mA A(B) = 0V, B(A) = Vcc
Min. -- -- 100
Typ. 5 10 --
(1)
Max. 7 15 --
Unit mA
NOTES: 1 . Typical values are at Vcc = 5.0V, +25°C ambient. 2 . The voltage drop between the indicated ports divided by the current through the switch. 3 . Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
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IDT74FST163861 20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4,5) Total Power Supply Current(6) VCC = Max. VIN = 3.4V(3) VCC = Max., Outputs Open Enable Pin Toggling 50% Duty Cycle VCC = Max., Outputs Open Two Enable Pins Toggling fi = 10MHz 50% Duty Cycle VIN = VCC VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND Test Conditions(1) Min. -- -- Typ.(2) 0.5 30 Max. 1.5 400 Unit mA µA/ MHz/ Enable mA
IC
-- --
0.6 0.7
8 9.5
NOTES: 1 . For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. TA = 40°C to +85°C 2 . Typical values are at VCC = 5.0V, +25°C ambient. 3 . Per TTL driven input (VIN = 3.4V). All other inputs at VCC or GND. Switch inputs do not contribute to ICC. 4 . This parameter represents the current required to switch the internal capacitance of the control inputs at the specified frequency. Switch inputs generate no significant power supply currents as they transition. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5 . CPD = ICCD/VCC CPD = Power Dissipation Capacitance 6 . IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fiN) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL) fi = Control Input Frequency N = Number of Control Inputs Toggling at fi
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10%
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description(1) Data Propagation Delay A to B, B to A(2) Switch CONNECT Delay xOE to A or B Switch DISCONNECT Delay xOE to A or B Charge Injection During Switch DISCONNECT xOE to A or B(3) VCC = 5V ± 10% Min. -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 7 -- VCC = 4V Max. 0.25 7 7 -- Unit ns ns ns pC
NOTES: 1 . See test circuits and waveforms. 2 . The bus switch contributes no Propagation Delay other than the RC Delay of the load interacting with the RC of the switch. 3 . |QCI| is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. Charge injection is reduced because the injection from the DISCONNECT of the first path is compensated by the CONNECT of the second path.
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IDT74FST163861 20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 OPPOSITE PHASE INPUT TRANSITION V OU T 7.0V SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH tPHL tPHL 3V 1.5V 0V VOH 1.5V VO L 3V 1.5V 0V
Propagation Delay Test Circuits for All Outputs
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL SYNCHRONOUS CONTROL
tSU
tH
tREM
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
tSU
tH
Set-up, Hold, and Release Times
VCC ENABLE 1 MHz Signal Generator Enable/Select Switch In Switch In (MUX) (2)
(1 )
DISABLE 3V 1.5V 0V 3.5V 0.3V tPHZ 0.3V 1.5V 0V VO H 0V V OL
Switch D.U.T. Out
V O UT
(3 )
CONTROL INPUT CL = 50pF t P ZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED t PZH SWITCH OPEN 3.5V 1.5V t P LZ
Charge Injection
NOTES: 1 . Select is used with multiplexers for measuring IQDCII during multiplexer select. During all other tests Enable is used. 2. Used with multiplexers to measure IQDCII only. 3. Charge Injection = VOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII. VOUT is the change in VOUT and is measured with a 10M probe.
Enable and Disable Times
NOTES: 1 . Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2 . Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
1.5V
Pulse Width 5
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